Math: Decimals

Adding Decimals

100

Find the value:

14.3 + 37.8

52.1

200

Find the value:

31.26 + 17.5

48.76

300

Find the value:

213.60 + 46.1

259.7

400

Find the value:

311.8 + 47.922

359.722

500

Find the value:

91.22 + 650.037

741.257

Subtracting Decimals

100

Find the value:

35.9 - 12.3

23.6

200

Find the value:

44.43 - 16.22

28.21

300

Find the value:

156.2 - 132.1

24.1

400

Find the value:

263.41 - 216.8

46.61

500

Find the value:

613.2 - 425.877

187.323

Ordering Decimals

100

Put the following decimals in order from least to greatest:

3.5, 1.8, 2.4

1.8, 2.4, 3.5

200

Put the following decimals in order from least to greatest:

5.4, 5.2, 5.8

5.2, 5.4, 5.8

300

Put the following decimals in order from least to greatest:

7.23, 7.2, 7.32

7.2, 7.23, 7.32

400

Put the following decimals in order from least to greatest:

4.509, 4.59, 4.5

4.5, 4.509, 4.59

500

Put the following decimals in order from least to greatest:

8.101, 8.011, 8.1, 8.001

8.001, 8.011, 8.1, 8.101

Rounding Decimals

100

Round the following number to the nearest whole number, tenth, and hundredth:

3.621

• Nearest whole number: 4 
• Nearest tenth: 3.6 
• Nearest hundredth: 3.62 

200

Round the following number to the nearest whole number, tenth, and hundredth:

7.456

• Nearest whole number: 7 
• Nearest tenth: 7.5
• Nearest hundredth: 7.46

300

Round the following number to the nearest whole number, tenth, and hundredth:

12.749

• Nearest whole number: 13 
• Nearest tenth: 12.7 
• Nearest hundredth: 12.75 

400

Round the following number to the nearest whole number, tenth, and hundredth:

24.995

• Nearest whole number: 25 
• Nearest tenth: 25.0 
• Nearest hundredth: 25.00 

500

Round the following number to the nearest whole number, tenth, and hundredth:

18.999

• Nearest whole number: 19
• Nearest tenth: 19.0 
• Nearest hundredth: 19.00

Word Problems

100

Maya has 2.5 meters of ribbon. Her friend gives her 1.3 meters more. How many meters of ribbon does Maya have now?

3.8 meters

• 2.5+1.3=3.82.5+1.3=3.8 meters
• Strategy: Add 2 meters + 1 meter = 3 meters, then add 0.5 + 0.3 = 0.8 meters, so 3 + 0.8 = 3.8 meters

200

A glass contains 8.7 liters of juice. After pouring a drink, there are 3.2 liters left. How many liters were poured out?

5.5 liters

• 8.7−3.2=5.58.7−3.2=5.5 liters
• Strategy: Subtract by place value: 8 - 3 = 5 liters, and 0.7 - 0.2 = 0.5 liters, so 5 + 0.5 = 5.5 liters

300

Kevin walked 12.45 kilometers on Saturday and 8.6 kilometers on Sunday. How many kilometers did he walk in total over the two days?

21.05 kilometers

• 12.45+8.6=21.0512.45+8.6=21.05 kilometers
• Strategy: Align by place value. 12.45 + 8.60 = 21.05 kilometers (add the ones, tenths, and hundredths separately)

400

A pizza costs 25.30 dollars. The store is having a sale and takes off 17.48 dollars. What is the new price of the pizza?

7.82 dollars

• 25.30−17.48=7.8225.30−17.48=7.82 dollars
• Strategy: Use the standard algorithm: Align by place value and subtract, regrouping as needed from the tenths and ones places

500

A baker had 15.75 kilograms of flour. She received a delivery of 9.30 kilograms more. After baking, she used 8.25 kilograms. How much flour does the baker have left?

16.80 kilograms (or 16.8 kg)

• Step 1: 15.75+9.30=25.0515.75+9.30=25.05 kilograms (total flour after delivery)
• Step 2: 25.05−8.25=16.8025.05−8.25=16.80 kilograms (subtract flour used for baking)